Set style classes for extension download dialog

So that the layout is correct.

https://bugzilla.gnome.org/show_bug.cgi?id=739888
Updated Spanish translation
viewSelector: Hide workspace page after animating to app picker

WorkspacesDisplay relies on being hidden to disable workspace switches
by scrolling or panning. Usually viewSelector will hide the previous
page on page switch, but we currently miss the case when opening the
overview at the app picker, where the workspaces page is still shown
for the transition, but never hidden.
Fix this by calling hide() in addition to setting the opacity to 0 at
the end of the overview animation.

https://bugzilla.gnome.org/show_bug.cgi?id=737534
ibusManager: Preload all ibus input sources in user configuration

Normally users switch xkb input sources and ibus input sources.
But currently the first input source only is running. It's also good
to preload all ibus engines in the logging session so that users switch
input sources quickly without the launching time of input sources.

The following is the ibus change:
https://github.com/ibus/ibus/commit/cff35929a9

https://bugzilla.gnome.org/show_bug.cgi?id=695428
environment: Define N_() globally

Commit 1291bcd0c84 implemented it for dateMenu, but the function
is already used in screenShield as well. Just add it globally as
we do for other standard gettext "macros".
shellDBus: don't consider a zero-index monitor invalid

Currently, shellDBus only uses the passed in monitor index if it's
strictly > 0. A zero-index monitor is a valid one though, so don't
restrict this to strictly positive indices.

https://bugzilla.gnome.org/show_bug.cgi?id=740074
shellDBus: Emit a PropertyChanged for OverviewActive

I was going to add another DBus property to signal when the shell was
done loading and was idle, and while implementing that I noticed we
aren't emitting PropertyChanged for, well, any property.  Let's fix
OverviewActive.

It's unfortunate it's so tedious to correctly implement a DBus
property =/

https://bugzilla.gnome.org/show_bug.cgi?id=704163
Update Vietnamese translation

Signed-off-by: Trần Ngọc Quân <vnwildman@gmail.com>
Updated Korean translation
Added Norwegian bokmål translation from Åka Sikrom.
network: properly remove connections from list

Due to a typo we were always removing the first (index 0) connection
from the global list of connections instead of the correct one.

This resulted in some connections remaining in the shell's connection
list long after they were removed.  In particular, this resulted in
multiple copies of a bluetooth connection appearing after suspend/resume
(when the device was readded and the cached connection list was
rescanned).

https://bugzilla.gnome.org/show_bug.cgi?id=740227
gdm: disallow cancel after verification succeeds

Once verification has succeeded, the train's already
left the building and we shouldn't allow canceling.

This commit renders the cancel button non-reactive
and makes the cancel function be a noop after
verification succeeds.

https://bugzilla.gnome.org/show_bug.cgi?id=740141
gdm: fix sensitivity of auth prompt when cancelling early and user list is disabled

If the user list is disabled and the user clicks cancel quickly enough
after typing their username, they can get in a state where the
auth prompt gets stuck in the insensitive state.

This is because the login dialog code makes the prompt insensitive
while while pam is processing the provided username, but the prompt
only makes itself sensitive again when it is hidden.

This commit makes it sensitive right before asking for a username again.

https://bugzilla.gnome.org/show_bug.cgi?id=740141
St: support css margin property

It's implemented similar to the padding property, but instead of taking
into account the margin values at drawing time in node-drawing, we set
the clutter actor margins in StWidget when the style is computed.

In the case that a CSS margin is not specified, we don't to set a value
of 0 to the clutter actor margin. In this manner it allows to use
Clutter margin values set in the code. However, the margins that are set
both in the code and in the CSS on the same side, the result is
unpredictable.

We avoid to set the clutter actor margin values to 0 if there's no CSS
margin values defined, so we still allow clutter actors to use margin
set in the code.

https://bugzilla.gnome.org/show_bug.cgi?id=728437
Updated Hebrew translation
theme: Fix sintax error in the theme
theme: rewrite to be structured
- using SASS
- trying to reuse as much of the gtk adwaita as possible
theme: use Adwaita dark style for popup menus

- cannot sue box-shadow sadly.
theme: update some svg assets to adwaita 3.14 counterparts

- switches
- checkboxes
theme: fine tune scrollbars